Amplifying-magnet system for telegraphones.



No. 882,328. PATENTED MAR. 17, 1908. J. A. LIEB.

AMPLIFYING MAGNET SYSTEM FOR TELBGRAPHONES.

AYPLIOATION rum: MAR. 25. 1907'.

q/vwnwaeo M? $25 f, M7

UNITED sTArrns 1 n frENT OFFICE.

JOHN LIEB, OF NEW YORK, N. Y., ASSIGNOR TO AMERICAN TELEGRAIIIO'NE OMPANY,

A CORPORATION OF THE DlS'lItRlT OF COLUMBIA.

no. ssasais.

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Patented March 17, 1998.

Application fllqd larcli 25, 1907. Serial No. 864,507.

To all whom it may concern: 1

Be it known that I, JOHN A. LIEB, a citizen of the United States, residing at the city of New York, in the borough of Brooklyn and State of New York, have invented certain new'and useful Improvements in Amplifying- Magnet Systems for Telegraphones, of which the following is a full, clear, and exact descigption.

y the apparatus for magnetically recording and reproducing sound phone.

The present invention is designed to secure better records with a given speed of the recording medium, or in some'cases to reduce the s eed of the medium without sacrificing the cearness'and volume of the reproduce sound.

The essential principle of thetelegraphone and similar apparatus depends upon the magnetization of a steel ribbon, plate, wire or disk, under the influence of the varying energization of an electromagnet in a telephone cir'cuit and which afterward acts as a generator or transmitter to reproduce the sound. In order to male a permanent record. in this way, and one which is capable of efficient reproduction, it is necessary in practice to have a very small magnet. But a small magnet does not generate the reproduction currents with as great intensity as is desirable, and attempts have been made to amplify the energy of the reproduction or retransmission currents in various ways.

By the present invention insteadof using a single magnet, I divide the energy of the original receiving circuit among a number of small magnets, each of which is not larger than the prescribed-size made, necessary in tele raphone work.

T e invention further consists in the features of construction and combination hereinafter set forth and claimed.

In the drawings: Figure 1 is a diagrammatic view, showing an apparatus embodying the principles of.my invention and having a steel-ribbon or tape for the recording medium; Fig. 2 is a top or plan view of the same-with the electrical circuits omitted; and Fig. 3 shows a magnet of slightly modified construction which may be used.

Referrin to the drawings in which like parts are esignated by the same reference sign, 1 and 2 mdicate reels from one to the invention relates to improvements in nown as the telegraother of which is wound the steel ribbon or tape 3* as required. This strip or ribbon therefore constitutesthe recording medium and reproducing medium. 4 indicates electromagnets which have the small projecting poles 5. There are five of the magnets 4 shown, and each of these is of just suflicient size to utilize one-fifth of the energy .ofthe tele hone circuit.

T e disposition of the ma nets 4 is-such that their poles 5 traverse di erent paths on the recording medium 3: For this purposeI have shown the magnets 4 lying in a row diagonally across the strip 3. This disposition gives each of the poles 5 a separate path of action, the various paths being, however, closely adjacent to one another so as to economize in the material of the recording medium.

The telephone circuits for the magnets 4 may be of the usual or any desired sort. I have shown a transmitting tele hone setA,

- and a receiver B, and a double lade switch C, by which the transmitting set or thereceiver are thrown on to the circuit wires 1, 1 with the wires 1 and 1 but they could be equally well in a series circuit provided their winding resistance was made suitable therefor. The reels 1 and 2 are rotated to feed the recording medium 3 in any convenient way. I have shown a pulley 6 merely for the urposes of illustratlon. The character and method of moving the recording medium do not constitute an essential part of the present invention.

While I have shown a particular construction having separate magnets 4, I do not derateprongs which traverse different paths on the recording medium. This form -of the invention is illustrated in Fig. 3.

What I claim is 1. The method of recordingand re roducing sound, which consists in trans orming the sound into telephonic currents, dividing the energy thereof among a pluralit of separate magnets, moving a single stee medium past all of said magnets so that difierent paths are traced thereon by the poles of said magnets, said medium moving at a compara- The magnets 4 are in a multiple circuit the tively slow speed, and finally reproducing the sound by repeating said operation with said magnets in a single receiver circuit.

:2. in an apparatus for magnetically recording soun a plurality of magnets in a common telephone circuit, and a steel medium moving past said magnets, the different magnet poles describing diflerent paths thereon.

8. in an a paratus for magnetically recording sound a plurality of magnets in a common tele hone circuit, and a steel tape or ribbon mova le past said magnets, the difierent poles describing difierent paths thereon.

4. in an apparatus for magnetically recording sound, means in a telephone circuit for producing a plurality of magnet .pols,

' and a steel tape or ribbon movable past said poles, the different poles describing dilierent paths thereon.

5. In an apparatus for magnetically reeeaeee common telephone circuit, each of said mag nets. being 0 just such a size that the entire number just absorb the av'ailable energy of the telephone circuit, and a medium movable past the poles of said magnets the difierent poles describing difierent paths thereon.

6. In an apparatus for magnetically recording sound, a plurality of magnets in a common telephone circuit, and a steel ta e or ribbon movable past saidmagnets, t e

diiierent magnets lying in a diagonalrow across the tape or. ribbon, whereby the different poles each describe a difierent path on the tape or ribbon.

in Witness whereof, I subscribe my signa.-.

ture, in the presence of two witnesses.

JOHN A. LIEB. Witnesses: 1

WALDO M. CHAPIN,

MAY Bran. 

